Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
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GRINDS DRILL…
Getting a smooth surface — a long and laborious process. Cut it will help the sanding attachment on a drill, which is a cylinder with an oblique gap, which made the ends of strips of sandpaper.
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Fighter-bomber FIAT G. 91. In February 1952, at the ninth session of the Atlantic Council in Lisbon, the decision was made for the NATO standard combat aircraft is a light fighter-bomber...
